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We get from A to B, by
changing AND shapes to
OR ones, and putting new
"bubbles" and removing
old ones.
To get from B to C, we
slide the "bubbles" on
the right hand gates
along the leads.
To get from C to D, we
remove the left hand
gates because they are
redundant.
Their outputs go low
when activated.
Their inputs are taken
low to activate the
gates.
The outputs follow the
inputs.
Replace the gates with a
piece of wire.
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